Flow structure around a fixed-supported flexible wing during flutter

IF 2.8 2区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Thermal and Fluid Science Pub Date : 2025-05-14 DOI:10.1016/j.expthermflusci.2025.111525

Si Peng , Md. Mahbub Alam , Yu Zhou

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引用次数: 0

Abstract

This work aims to investigate experimentally the flow structure around a flexible wing undergoing flutter. The nominal angle α₀ of attack examined is 0° − 10°, and the chord-based Reynolds number Re_c is 6.4 × 10⁴ − 1.9 × 10⁵, corresponding to the reduced velocity U_r of 23––70. Three types of flutter are identified, i.e. classical-like (0°−2°), light-stall-like (2°−6°) and deep-stall-like (6° − 8°) flutters, which exhibit features similar to classical, light- and deep-stall flutters associated with spring-supported rigid wings. However, appreciable differences are presently captured in both structural vibration and flow structure between the flexible and rigid wings, which are discussed in detail. Conceptual flow structure models are proposed to summarize the flow structures around the flexible wing undergoing the three types of flutters and their distinct characteristics compared to their counterparts of a rigid wing. Hysteresis phenomena, including dynamic overshoot and undershoot are observed during flutter, and the underlying flow physics is discussed in detail.

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定支柔性机翼颤振时的流动结构

本文旨在通过实验研究柔性机翼在颤振作用下的流动结构。所测名义攻角α0为0°~ 10°，弦基雷诺数Rec为6.4 × 104 ~ 1.9 × 105，对应的降速Ur为23 ~ 70。确定了三种类型的颤振，即经典型（0°- 2°）、轻失速型（2°- 6°）和深失速型（6°- 8°）颤振，它们表现出与弹簧支撑刚性机翼相关的经典、轻失速和深失速颤振相似的特征。然而，目前在柔性翼和刚性翼之间的结构振动和流动结构上都有明显的差异，对此进行了详细的讨论。提出了概念流动结构模型，总结了三种颤振方式下柔性翼的流动结构及其与刚性翼的不同特点。研究了颤振过程中的滞回现象，包括动态超调和动态欠调，并详细讨论了潜在的流动物理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Thermal and Fluid Science 工程技术-工程：机械

CiteScore

6.70

自引率

3.10%

发文量

159

审稿时长

34 days

期刊介绍： Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.